Q21. What is Redux DevTools?
_Redux DevTools_ is a live-editing time travel environment for Redux with hot reloading, action replay, and customizable UI. If you don't want to bother with installing R...
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Q22. What are the features of Redux DevTools?
Some of the main features of Redux DevTools are below, 1. Lets you inspect every state and action payload. 2. Lets you go back in time by _cancelling_ actions. 3. If you ...
Q23. What are Redux selectors and why use them?
_Selectors_ are functions that take Redux state as an argument and return some data to pass to the component. For example, to get user details from the state: ```javascri...
Q24. What is Redux Form?
_Redux Form_ works with React and Redux to enable a form in React to use Redux to store all of its state. Redux Form can be used with raw HTML5 inputs, but it also works ...
Q25. What are the main features of Redux Form?
Some of the main features of Redux Form are: 1. Field values persistence via Redux store. 2. Validation (sync/async) and submission. 3. Formatting, parsing and normalizat...
Q26. How to add multiple middlewares to Redux?
You can use `applyMiddleware()`. For example, you can add `redux-thunk` and `logger` passing them as arguments to `applyMiddleware()`: ```javascript import { createStore,...
Q27. How to set initial state in Redux?
You need to pass initial state as second argument to createStore: ```javascript const rootReducer = combineReducers({ todos: todos, visibilityFilter: visibilityFilter, })...
Q28. How Relay is different from Redux?
Relay is similar to Redux in that they both use a single store. The main difference is that relay only manages state originated from the server, and all access to the sta...
Q29. What is an action in Redux?
_Actions_ are plain JavaScript objects or payloads of information that send data from your application to your store. They are the only source of information for the stor...
Q30. What is reselect and how it works?
_Reselect_ is a **selector library** (for Redux) which uses _memoization_ concept. It was originally written to compute derived data from Redux-like applications state, b...